JP4758309B2 - Multi-fluid heat exchanger and manufacturing method thereof - Google Patents

Description

  The present invention relates to a multi-fluid heat exchanger that exchanges heat between at least three different fluids and a method for manufacturing the same.

As an example, an integrated multi-fluid heat exchanger is known in which a marine intercooler and a condenser are integrated, and two types of high-temperature gas flowing through them are simultaneously cooled by a coolant such as cooling water. In this case, a large number of tubes are arranged in parallel, both ends of each tube communicate with a pair of tanks to form a core, a partition is provided in the middle of the core, and the outer periphery of the core is fitted with a casing. Then, the cooling water can be circulated in each tube through the tank, and the first fluid and the second fluid can be circulated on both sides of the partition, so that each fluid can be cooled by the cooling water.
In such a heat exchanger, as a more compact heat exchanger having a smaller number of parts, each tube constituting the core is formed by combining a pair of flat channel plates, and dimples project from the outer surface of the tube. As a result, there is a heat exchanger in which adjacent tubes are brought into contact with each other at the dimple portion and the whole is integrally brazed and fixed. Such a heat exchanger can reduce the pitch between the tubes, thereby increasing the heat radiation area and promoting heat exchange.

  The heat exchanger of FIGS. 10-13 is the example. In this heat exchanger, a large number of flat tubes 1 are arranged in parallel, and are in contact with each other by dimples 13 protruding from the outer surface thereof, and both ends of each tube 1 are inserted into the tube insertion holes 3 of the pair of tube plates 2, A partition plate 4 is arranged in the middle of the tubes 1 in the parallel direction, and both ends thereof are inserted into the slits 5 of the tube plate 2 as shown in FIG. A tank body 12 a is fitted on the tube plate 2, and the tank 12 is configured by them. Next, the partition plate 4 is formed in a flat plate shape, temporary support bodies 17 are positioned on both sides thereof, and the outer surface of each temporary support body 17 contacts the dimple 13 of the adjacent tube 1. As shown in FIG. 12, each tube 1 is composed of a pair of shallow grooves formed in opposite directions, and dimples 13 project from the outer surface of each groove plate.

The core 6 assembled in this manner is compressed from both sides of the tube 1 in the parallel direction, and is inserted into a high-temperature furnace in the compressed state, and the parts are integrally brazed and fixed. Next, the provisional body 17 is removed from the brazed core. Next, the casing 7 is fitted on the outer periphery of the core 6. The casing 7 is composed of at least two parts and is a combination thereof. Then, the overlapping portion is welded by TIG welding or the like, and the both ends in the longitudinal direction and the tube plate 2 are integrally fixed by welding.
As shown in FIG. 11, a pair of first inlet / outlet pipes 9 and second inlet / outlet pipes 10 are attached to the casing 7 on both sides of the partition plate 4 so that the first fluid flows from the first inlet / outlet pipe 9. Then, the second fluid flows from the second inlet / outlet pipe 10. Then, the third fluid flows through each tube 1 through the third inlet / outlet pipe 11 projecting from the tank 12. Then, heat exchange is performed between the third fluid and the first fluid and between the second fluid and the third fluid.

  Thus, a heat exchanger with a small tube pitch in which the tubes 1 are in contact with each other and having the partition plate 4 in the middle requires a pair of temporary support bodies 17 as described above when the core 6 is manufactured. I was trying. This is because it is difficult to manufacture the tube plate to directly contact the outer surface of the tube 1 with the flat partition plate 4. That is, the pitch of the tube insertion holes 3 through which both ends of the tube 1 are inserted is relatively short, and the distance T between the hole edges of the adjacent tube insertion holes 3 is twice the height of the dimple 13 (FIG. 13). This distance T is set to the minimum necessary to limit the hole processing by the press. In other words, if the distance T is made smaller, the hole processing of the adjacent tube insertion holes 3 influences each other during pressing, and the accuracy of the tube insertion holes 3 cannot be maintained accurately. This drilling causes the same problem in the slit 5 that passes through the end portion of the partition plate 4 and the adjacent tube insertion hole 3, and the interval between them needs to be T or more.

  Then, a gap is generated between the flat partition plate 4 and the outer surface of the adjacent tube 1. If the tube 1 is fastened from both sides for brazing while leaving this gap, the tube 1 is deformed, and the brazing reliability cannot be maintained. That is, since the tube 1 consists of a pair of shallow groove-shaped plates, it is necessary to braze it in the state fastened together. And each tube 1 expand | swells thermally at the time of brazing, and there exists a possibility of expanding and deform | transforming also in the thickness direction. In order to prevent the deformation, it is necessary to braze them from both sides of the core 6 in a fastening state.

Another problem arises when the temporary body 17 is present on both sides of the partition plate 4. That is, it is necessary to remove the temporary body 17 after brazing. Then, after removing the temporary body 17, it is necessary to fit the casing 7 around the outer periphery of the temporary body 17 and to weld and fix the space between the casing 7 and the tube plate 2 in an airtight manner, which increases the number of manufacturing steps and is troublesome. It was.
Furthermore, a gap is formed in the portion where the temporary body 17 is removed, and there is a possibility that the first fluid and the second fluid may be bypassed therefrom.
Then, this invention makes it a subject to solve the problem which concerns.

The present invention according to claim 1 is that a plurality of flat tubes (1) are juxtaposed such that a part of adjacent flat outer surfaces are in contact with each other, and both ends of each tube (1) are a pair of tube plates. (2) is inserted through the tube insertion hole (3),
A partition plate (4) is placed in the middle of each tube (1) in the parallel direction, and both ends of the partition plate (4) are inserted into the slits (5) of the tube plate (2) to form the core (6). ,
The outer periphery of the core (6) is fitted with the casing (7),
On both sides of the partition plate (4), the first fluid flows through one side of the casing (7), the second fluid flows through the other side, and the third fluid flows through the tube (1). In a multi-fluid heat exchanger
The partition plate (4) is formed in a shallow dish shape having a flange portion (4c) on the outer periphery, and both ends of the flange portion (4c) are the slits (5) of the pair of tube plates (2). Inserted into the
A dish-shaped cup plate (8) is fitted into the recessed portion (4a) of the partition plate (4) so that the recessed portion (8a) faces the recessed portion (4a) of the partition plate (4). ,
This is a multi-fluid heat exchanger in which the outer surfaces of the partition plate (4) and the cup plate (8) are in contact with a part of the outer surface of the tube (1) facing each other and are brazed and fixed as a whole.

The present invention according to claim 2 is the method according to claim 1,
The casing (7) includes a pair of first plates (7a) covering both sides of the core (6), and a pair of second plates (7b) covering the front and back surfaces of the core (6). Consisting of
Projections (4d) are formed on both sides of the partition plate (4), and the projections (4d) of the partition plate (4) are fitted into the slits (15) of the pair of second plates (7b). It is a fluid heat exchanger.

According to a third aspect of the present invention, in the first or second aspect,
The multi-fluid heat exchanger is provided with notched portions (8b) for bleeding air at both longitudinal ends of the cup plate (8).

According to a fourth aspect of the present invention, in the method for producing a multi-fluid heat exchanger according to the second aspect,
After assembling the core (6), a step of fitting the casing (7) on the outer periphery thereof and assembling the whole, and a step of brazing integrally with the whole being fastened from the outer periphery to the center side. It is the manufacturing method of the multifluid heat exchanger characterized by comprising.

In the multi-fluid heat exchanger according to the present invention, the cup plate 8 is fitted into the recessed portion 4a of the partition plate 4 located in the middle of the core 6, and the outer surfaces thereof are in contact with a part of the outer surface of the opposite tube 1. Since the whole is fixed by brazing integrally, it is not necessary to insert a temporary body as in the conventional case when brazing the core 6, and it is possible to prevent deformation due to thermal expansion of each tube 1. The reliability of attachment can be improved. That is, a conventional temporary body can be formed by the partition plate 4 and the cup plate 8 of the present invention.
Furthermore, in the assembled state in which the casing 7 is fitted on the outer periphery of the core 6, the entire casing 7 and the casing 7 can be brazed and fixed together, and a heat exchanger with high mass productivity can be provided.

  In the above-described configuration, the casing 7 is formed of a combination of a pair of first plate 7a and second plate 7b, provided with projections 4d on both sides of the partition plate 4, and the projections 4d are connected to the pair of second plates 7b. It is possible to fit into the slit 15. Thereby, the assembly of the core 6 and the casing 7 can be facilitated, and the reliability of brazing can be improved by positioning the both.

  In the above-described configuration, the air vent notch 8b can be provided at both longitudinal ends of the partition plate 4. Thereby, even if the air in the space formed by the cup plate 8 and the partition plate 4 fitted to each other expands during brazing, the air is released to the outside, and the brazing reliability can be secured. At the same time, dew condensation or the like generated inside them during use can be easily caused to flow down.

  In the manufacturing method of the multi-fluid heat exchanger having the above-described configuration, after assembling the core 6, the casing 7 is fitted on the outer periphery and the whole is assembled, and the whole is integrally fastened from the outer periphery to the center side. By providing the step of brazing and fixing, it is possible to braze and fix the whole as a whole in a state where the connecting portions between the components are reliably in contact with each other. Thereby, a highly reliable multi-fluid heat exchanger can be provided.

Next, embodiments of the present invention will be described with reference to the drawings.
1 is a partially cutaway front view of the heat exchanger of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, FIG. 3 is a cross-sectional view taken along the line III-III in FIG. FIG. 5 is a front view showing a state in which the partition plate 4 and the cup plate 8 used in the heat exchanger are separated from each other, FIG. 6 is a right side view thereof, and FIG. FIG. FIG. 8 is a front view showing the assembled state of the heat exchanger, and FIG. 9 is a right side view thereof. In addition, the same number is attached | subjected to the same component as a conventional type heat exchanger, and duplication of description is abbreviate | omitted as much as possible about the same part of a structure.

In this heat exchanger, the difference from the prior art is a partition plate 4, a cup plate 8 and a casing 7. Each of the tubes 1 and the tank 12 is the same as that of the prior art, and the tubes 1 are each formed by reversing a pair of shallow groove-like plates, and dimples 13 project from the outer surfaces thereof.
As shown in FIGS. 5 to 7, the partition plate 4 is formed to be recessed in a substantially rectangular shallow dish shape or pan shape, and a flange portion 4 c is provided on the outer periphery thereof. A projecting portion 4e is projected from the center of the upper and lower ends of the flange portion 4c. Further, on both sides of the partition plate 4, projecting portions 4 d protrude from the flange portion 4 c at the upper and lower end positions and the intermediate position, respectively.

  The cup plate 8 is formed in a dish shape or a shallow pan shape having an outer periphery that matches the inner periphery of the recessed portion 4a of the partition plate 4, and the recessed portion 4a of the partition plate 4 and the recessed portion 8a of the cup plate 8 face each other. Both are fitted so as to. Cutout portions 8b are formed at both upper and lower ends of the cup plate 8 as shown in FIG. 1 and FIG. 2, they are inserted into the intermediate position of the tube 1 in the parallel direction, and the dimples of the tube 1 in which the outer surface of the cup plate 8 and the outer surface of the partition plate 4 are adjacent to each other are inserted. Contact 13 Then, the protrusions 4e at the upper and lower ends of the partition plate 4 are fitted into the slits 5 of the tube plate 2 as shown in FIGS. Further, the opening side of the tank body 12a is fitted to the tube plate 2 to constitute the tank 12, and the core 6 is assembled.

  The casing 7 is fitted on the outer periphery of such a core 6. As shown in FIG. 2, the casing 7 is composed of a combination of a pair of first plates 7 a that covers both sides of the core 6 and a pair of second plates 7 b that covers the front and back surfaces of the core 6. In addition, slits 15 are formed in the upper and lower end portions and the intermediate portion of the second plate 7b at positions aligned with the protruding portions 4d of the partition plate 4, respectively. Therefore, first, the pair of second plates 7 b are fitted on the front and back surfaces of the core 6. At this time, the upper and lower ends are in contact with the outer periphery of the tube plate 2. Then, the projection 4d of the partition plate 4 is fitted into each slit 15. Next, a pair of first plates 7 a are fitted on both sides of the core 6. At this time, the inner surface of the first plate 7a contacts the dimple 13 of the adjacent tube 1. A pair of tanks 12 are each provided with a third inlet / outlet pipe 11, and each second plate 7 b is provided with a pair of first inlet / outlet pipes 9 and second inlet / outlet pipes 10 on both sides of the partition.

After all the parts are assembled in this manner, the pair of first plates 7a are compressed together, and the tubes, the partition plate 4 and the cup plate 8 are inserted into a high-temperature furnace in contact with each other. Thus, the parts are brazed and fixed integrally and in an air-tight and liquid-tight manner. And the heat exchanger shown in FIG.8 and FIG.9 is completed.
In such a heat exchanger, as an example, cooling water circulates as a third fluid from the third inlet / outlet pipe 11 into each tube 1 and passes through the pair of second inlet / outlet pipes 10 on the right side in FIG. Two fluids circulate, and the second fluid circulates through the pair of first inlet / outlet pipes 9 on the left side. Then, heat is exchanged between the third fluid and the first fluid, and between the third fluid and the second fluid.
The first to third fluids are not limited to the above example, and appropriate fluids can be circulated to exchange heat with each other.

The partially broken front view of the heat exchanger of this invention. II-II arrow sectional drawing of FIG. III-III arrow sectional drawing of FIG. IV-IV arrow cross-sectional schematic of FIG. The front view which shows the state which isolate | separated the partition plate 4 and the cup plate 8 which are used for this heat exchanger slightly. The right side view. FIG.

The front view which shows the assembly state of the same heat exchanger. The right side view. Explanatory drawing which shows the manufacturing process of the core 6 of a conventional heat exchanger. The same side view. XII-XII arrow sectional drawing of FIG. FIG. 11 is an enlarged sectional view of a portion XIII in FIG. 10.

Explanation of symbols

1 Tube 2 Tube plate 3 Tube insertion hole 4 Partition plate
4a Recess
4c Flange
4d protrusion
4e Projection 5 Slit 6 Core

7 Casing
7a First plate
7b Second plate 8 Cup plate
8a Recess
8b Notch 9 First inlet / outlet pipe
10 Second entrance pipe

11 Third entrance pipe
12 tanks
12a Tank body
13 dimples
14 Reinforcement rib
15 slit
16 Inner fin
17 Temporary body

Claims (4)

A number of flat tubes (1) are juxtaposed so that a part of the adjacent flat outer surfaces are in contact with each other, and both ends of each tube (1) are tube insertion holes (3) of a pair of tube plates (2). Inserted into
A partition plate (4) is placed in the middle of each tube (1) in the parallel direction, and both ends of the partition plate (4) are inserted into the slits (5) of the tube plate (2) to form the core (6). ,
The outer periphery of the core (6) is fitted with the casing (7),
On both sides of the partition plate (4), the first fluid flows through one side of the casing (7), the second fluid flows through the other side, and the third fluid flows through the tube (1). In a multi-fluid heat exchanger
The partition plate (4) is formed in a shallow dish shape having a flange portion (4c) on the outer periphery, and both ends of the flange portion (4c) are the slits (5) of the pair of tube plates (2). Inserted into the
A dish-shaped cup plate (8) is fitted into the recessed portion (4a) of the partition plate (4) so that the recessed portion (8a) faces the recessed portion (4a) of the partition plate (4). ,
A multi-fluid heat exchanger in which the outer surfaces of the partition plate (4) and the cup plate (8) are in contact with part of the outer surface of the tube (1) facing each other and are brazed and fixed as a whole. In claim 1,
The casing (7) includes a pair of first plates (7a) covering both sides of the core (6), and a pair of second plates (7b) covering the front and back surfaces of the core (6). Consisting of
A multifluid heat exchanger in which protrusions (4d) are formed on both sides of the partition plate (4), and the protrusions (4d) are fitted in the slits (15) of the pair of second plates (7b). In claim 1 or claim 2,
A multi-fluid heat exchanger in which notched portions (8b) for venting air are provided at both longitudinal ends of the cup plate (8). In the manufacturing method of the multifluid heat exchanger of Claim 2,
After assembling the core (6), a step of fitting the casing (7) on the outer periphery thereof and assembling the whole, and a step of brazing integrally with the whole being fastened from the outer periphery to the center side. A method for producing a multi-fluid heat exchanger, comprising: